I have a Spanish 7x57 mauser that I shoot S&B 140 grain that seem to be the most accurate groups, I have shot several brands and weights and the S&B's work best and have downed over 20 bucks with these rounds but some of what I have read is that modern cartridges are too "hot" for these old actions, my question is are there any factory rounds suitable for these old guns? I do not reload and have no plans to just for hunting, Thanks in advance!